docs: def info(self):
          """Retrieve information about the SD interface.
  
          Args::
  
            no argument
  
          Returns::
  
            2-element tuple holding:
              number of datasets inside the file
              number of file attributes
  
          C library equivalent : SDfileinfo
                                                    """
  
          status, n_datasets, n_file_attrs = _C.SDfileinfo(self._id)
          _checkErr('info', status, "cannot execute")
          return n_datasets, n_file_attrs